QOJ.ac

QOJ

ID	题目	提交者	结果	用时	内存	语言	文件大小	提交时间	测评时间
#16845	#2153. HILO	JohnAlfnov	100 ✓	88ms	3908kb	C++11	644b	2021-12-25 12:42:10	2022-05-04 12:01:24

Judging History

你现在查看的是最新测评结果

[2023-08-10 23:21:45]
System Update: QOJ starts to keep a history of the judgings of all the submissions.

[2022-05-04 12:01:24]
评测

测评结果：100
用时：88ms
内存：3908kb

查看

[2021-12-25 12:42:10]
提交

answer

#include<bits/stdc++.h>
#define mod 1000000007
using namespace std;
int f[2][2][5005],g[2][2][5005];
int main(){
	int n,x,b=0;
	scanf("%d%d",&n,&x);
	f[b^1][1][x]=1;
	for(int h=n-1;h>=0;--h,b^=1)for(int j=min(x,h);j>=0;--j){
		f[b][1][j]=(1ll*(h+1!=n)*f[b^1][1][j+1]*(h+1)+f[b^1][1][j+1]+f[b^1][0][j+1])%mod;
		g[b][1][j]=(1ll*(h+1!=n)*g[b^1][1][j+1]*(h+1)+g[b^1][1][j+1]+g[b^1][0][j+1]+f[b^1][0][j+1])%mod;
		f[b][0][j]=(1ll*(h+1!=n)*f[b^1][0][j]*(h+1)+f[b^1][1][j]+f[b^1][0][j])%mod;
		g[b][0][j]=(1ll*(h+1!=n)*g[b^1][0][j]*(h+1)+g[b^1][1][j]+g[b^1][0][j])%mod;
	}
	printf("%d\n",(g[b^1][0][0]+g[b^1][1][0])%mod);
	return 0;
}

源文件, 语言: C++11

详细

Test #1:

score: 3.84615

Accepted

time: 3ms

memory: 3812kb

input:

4 2

output:

result:

ok 1 number(s): "17"

Test #2:

score: 3.84615

Accepted

time: 3ms

memory: 3808kb

input:

60 10

output:

508859913

result:

ok 1 number(s): "508859913"

Test #3:

score: 3.84615

Accepted

time: 2ms

memory: 3820kb

input:

36 2

output:

653172943

result:

ok 1 number(s): "653172943"

Test #4:

score: 3.84615

Accepted

time: 1ms

memory: 3756kb

input:

38 12

output:

877759561

result:

ok 1 number(s): "877759561"

Test #5:

score: 3.84615

Accepted

time: 2ms

memory: 3784kb

input:

40 22

output:

587738552

result:

ok 1 number(s): "587738552"

Test #6:

score: 3.84615

Accepted

time: 1ms

memory: 3712kb

input:

42 9

output:

142300060

result:

ok 1 number(s): "142300060"

Test #7:

score: 3.84615

Accepted

time: 0ms

memory: 3784kb

input:

44 42

output:

194449602

result:

ok 1 number(s): "194449602"

Test #8:

score: 3.84615

Accepted

time: 2ms

memory: 3804kb

input:

46 41

output:

996298696

result:

ok 1 number(s): "996298696"

Test #9:

score: 3.84615

Accepted

time: 3ms

memory: 3804kb

input:

48 16

output:

933315069

result:

ok 1 number(s): "933315069"

Test #10:

score: 3.84615

Accepted

time: 2ms

memory: 3808kb

input:

50 1

output:

592235889

result:

ok 1 number(s): "592235889"

Test #11:

score: 3.84615

Accepted

time: 2ms

memory: 3800kb

input:

106 25

output:

370147128

result:

ok 1 number(s): "370147128"

Test #12:

score: 3.84615

Accepted

time: 3ms

memory: 3812kb

input:

162 125

output:

588210522

result:

ok 1 number(s): "588210522"

Test #13:

score: 3.84615

Accepted

time: 0ms

memory: 3832kb

input:

218 196

output:

722904144

result:

ok 1 number(s): "722904144"

Test #14:

score: 3.84615

Accepted

time: 1ms

memory: 3872kb

input:

275 77

output:

201201377

result:

ok 1 number(s): "201201377"

Test #15:

score: 3.84615

Accepted

time: 1ms

memory: 3784kb

input:

331 195

output:

105599195

result:

ok 1 number(s): "105599195"

Test #16:

score: 3.84615

Accepted

time: 0ms

memory: 3756kb

input:

387 160

output:

51654417

result:

ok 1 number(s): "51654417"

Test #17:

score: 3.84615

Accepted

time: 3ms

memory: 3832kb

input:

443 407

output:

973597938

result:

ok 1 number(s): "973597938"

Test #18:

score: 3.84615

Accepted

time: 3ms

memory: 3832kb

input:

500 196

output:

279036314

result:

ok 1 number(s): "279036314"

Test #19:

score: 3.84615

Accepted

time: 55ms

memory: 3900kb

input:

4944 2238

output:

373098474

result:

ok 1 number(s): "373098474"

Test #20:

score: 3.84615

Accepted

time: 75ms

memory: 3904kb

input:

4952 3750

output:

127862445

result:

ok 1 number(s): "127862445"

Test #21:

score: 3.84615

Accepted

time: 88ms

memory: 3888kb

input:

4960 2465

output:

524400159

result:

ok 1 number(s): "524400159"

Test #22:

score: 3.84615

Accepted

time: 75ms

memory: 3908kb

input:

4968 3013

output:

429923833

result:

ok 1 number(s): "429923833"

Test #23:

score: 3.84615

Accepted

time: 55ms

memory: 3844kb

input:

4976 2108

output:

909616241

result:

ok 1 number(s): "909616241"

Test #24:

score: 3.84615

Accepted

time: 47ms

memory: 3832kb

input:

4984 1656

output:

572267695

result:

ok 1 number(s): "572267695"

Test #25:

score: 3.84615

Accepted

time: 70ms

memory: 3900kb

input:

4992 3695

output:

824711289

result:

ok 1 number(s): "824711289"

Test #26:

score: 3.84615

Accepted

time: 9ms

memory: 3808kb

input:

5000 207

output:

765133070

result:

ok 1 number(s): "765133070"